Nonlinear control of STATCOM in presence of filter based on indirect control of DC link voltage

Abstract

In previous researches, a signal-based model of power network and STATCOM accompanied by its controller is presented. Using such a model, considering shunt filters is so complicated. Implementing filters is the most popular method of harmonic elimination in networks which contain FACTS & power electronic devices. Also, there is a need to simulate the real model of power network and STATCOM switching model. This type of modelling provides us with the capability of doing some important studies such as: fault analysis, stability analysis and other similar analyses about the interaction between STATCOM and the power network operation. In this paper, a real power and switching model of STAT COM accompanied by an efficient controller in presence of a shunt filter is proposed. This model makes it possible to easily adapt the controller operation in presence of filter, with no necessity of solving the complicated equations which exist in signal-based models. Using this model, the controller is designed when the shunt filter is utilized. Moreover, the effectiveness of filter utilization in reducing the current THD is also studied. The proposed STATCOM controller is nonlinear, which is based on indirect control of DC link voltage.